Based on the manga series by Hiromitsu Takeda, this romantic comedy is about Takeru Ohyama, a typical perverted teenage boy. His new school doesn't require entrance exams, and it just turned co-ed! Unfortunately, his dreams of a happy high school life are dashed when he finds out the school is much more than it seems. All of the students wield a special item—a Maken—to unleash their magical abilities in duels! Can Takeru find a Maken that works for him? Even while trying to fit in at a new school and dealing with all kinds of girl problems?

Takeru Ohyama has enrolled at Tenbi Academy, a high school that converted from all-girls to co-ed. Hoping to have a life full of ogling pretty girls, he reunites with childhood friend Haruko Amaya, who shows him around school. However, he learns that the school is for students who possess magical and spiritual energies called Elements and who wield crafted weapons known as Makens. The students engage in school sanctioned combat matches that showcase their powers. While his own ability and Maken is not apparent at first, Takeru soon finds himself surrounded by girls, including Inaho Kushiya, an attractive girl who says she's his fiancée, and Kodama Himegami, a popular blonde who says she wants to kill him. He joins the Security Committee (魔導検警機構, madō kenkei kikō?, lit. "anti-evil organization"), also known as Maken-ki, which supports the student council's operations.